Re: Silly query !

pmj wrote:
> "Jeff Gaines" <jgaines_newsid@xxxxxxxxxxx> wrote in message
> news:3kuv2aF10d7h7U1@xxxxxxxxxxxxxxxxx
>> On 29/07/2005 Flyiñg Ñuñ 2°°5 + wrote:
>>> Flyiñg Ñuñ 2°°5 + wrote:
>>>>
>>>> I am currently trying to upload a 3.5 MB file to
>>>> http://yousendit.com and it is literally taking hours.
>
> Nope, not *Hours* - but lots of Minutes!!!
>
>>>> ... Now as far as I can tell, I've checked it many times
>>>> in the past, my upload speed is in the range 256-276 Kbps
>
> Yep ADSL is *Asynchronous* Digital Subscriber Line - the *UpLoad*
> Speed is always much less than the DownLoad Speeed.
>
> The UpLoad Speed of a typical ADSL Connection is usually around about
> 256 kbps (subject to Network Conditions outside your Control)
>
> & that's 256 kbps - Kilo *bits* per Second, not Kilo *Bytes* per
> Second. There are (about) 10 bits in a Byte, when it comes to Internet
> Connection Speeds - a Byte is normally 8 bits, but there is an
> Overhead & HTTP File Trasnsfers have a higher (additional) Overhead
> than FTP Transfers...
>
> & it will also depend on the actual *File* Type (Contents) - some File
> Types (such as .ZIP Files & .JPEG Files) are already well Compressed,
> compared to, say Plain Text Files, so any Compression used in the
> Modem (yes, Modem Connections do apply (some) Compression "on the
> Fly"), will not be used.
>
>>>> ... So how long should it be taking? I'm ashamed to say it's got
>>>> me confuddled now. :(
>>>
>>> I reckon it should be around 3½-4 hours , is that correct.
>
> Nope - should be much quicker than that...
>
>> You need a science teacher to work it out for you :-)
>>
>> 3.5MB = (3.5 * 8) = 28 Mbits = (28 * 1024) = 28672 Kbits
>>
>> 28672 / 256 = 112 seconds
>>
>> That is obviously completely wrong so we need to find that teacher!
>>
>> I suspect it's nearer 11,200 seconds which is 3.1 hours but I'd be
>> interested to see the calculation set out properly for my own
>> edification :-)
>
> I'm not a Science (or Maths or Physics) Teacher, but I know how you
> can *roughly* work it out...
>
> There are 1024 KiloBytes in a Mega Byte, so 3.5 MB is about 3,584 KB
> So there are about 35,840 Kilo *bits* to Transfer (UpLoad)
>
> Divide 35,840 by 256 to get the number of Seconds - 140
>
> Which is near enough what you reckoned, taking into account the
> difference between having 8 & 10 bits in a Byte.
>
> So, a 3.5 MB File *should* (under optimum conditions, with a 256kbps
> UpLoad Speed) take about 2 & 1/2 Minutes.
>
> Obviously though, when UpLoading to a busy Server (such as the
> YouSendit.com Server?) over a Transatlantic Link, during the Day,
> over an ADSL Connection that has a fairly high Contention Ratio
> (50:1?) It will take longer.
>
> FN - Have you tried UpLoading the *same* file to your own (PlusNet)
> WebSpace, using FTP?
>
> That should be quicker, cos FTP is more efficient than HTTP for File
> Transfer & the PlusNet FTP Server is on the same Network as your
> Connection, with no Transatlantic Link
>
> HTH

I'll try that when I get back in later - sounds like a good idea
--
Heard melodies are sweet, but those Unheard melodies are sweeter
flyingnun@xxxxxxxxxxxxx FN 2°°5 +, Mungo Brandybuck of Buckland


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